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地球学报  2003 

北京房山侵入岩体:微量元素、稀土元素及Sr同位素组成对其成因的制约

Keywords: 脉动式侵位,平衡结晶,批式熔融,包体,房山岩体

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Abstract:

房山岩体是由3次脉动式侵位形成的复式岩体,不同期次侵位的岩石及其中的包体来自相同的岩浆源区,为下地壳的中、基性火成岩。全岩矿物RbSr等时线年龄为126±3Ma。第1期至第2期,主要是由以斜长石为主的矿物平衡结晶造成的;第2期至第3期,则可能是批式熔融的结果。包体的成因机制可能不止一种:英安玢岩质包体和石英粗安玢岩质包体可能分别代表第2期和第3期脉动式侵入体的冷凝壳;石英正长岩包体则可能代表该侵入体演化到最后的产物;而石英闪长质和石英二长闪长质包体则可能为同源岩浆早期结晶的产物。

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